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Spectrophotometric analysis and camera calibration applied to the study of rock art

Project financed by the Spanish Ministry of Economy and Competitiveness for the realisation of R&D&i Projects, reference number HAR2014-59873-R.

This project aims to integrate spectrophotometric analysis coupled with accelerated aging, colourimetry, and multispectral photographic images captured by a calibrated digital camera. This will offer one solution that will allow identifying and mapping the pigments automatically for maximum reliability in surveys / models / three-dimensional reconstructions (3D), or 4D.

The Project aimed at the following targets::

  • Geometric and radiometric calibration of image sensors (cameras).
  • Analysis of the colourimetric and spectral variation of micro-samples and correlation with radiometric values acquired with a digital camera.
  • Enhancement of the multispectral processing for the automatic detection of pigments on shelters.
  • Estimation of the spectral variability and 4D reconstruction of the scenes 3D modelled at present, in virtual environments.

The results show that:

  • Calibration of the instrument in both components, geometric and radiometric, allows us the accurate documentation of the actual state of our archaeological heritage.
  • Colourimetric variability can be undertaken with a digital camera instead of optical instrumentation much more sophisticated.
  • Enhancement of multispectral images (UV, VIS, NIR) allows users the detection of pigments and motifs hardly visible by the naked eye.
  • Spectral variability over time depends on the mineral composition of the interacting materials.
  • Virtual environments empower the dissemination of cultural heritage.

Derived research publications:

Documentación patrimonial mediante solutiones fotogramétricas y de escaneado láser, y su orientación a la generación de entornos virtuales.

Blanco, S.; Carrión, B.; Lerma, J. L. 2015. Documentación patrimonial mediante solutiones fotogramétricas y de escaneado láser, y su orientación a la generación de entornos virtuales. La Ciencia y el Arte V Ciencias experimentales y conservación del patrimonio, pp. 56-69. Ministerio de Educación, Cultura y Deporte. ISBN: 978-84-608-4003-9.

Basics of Range-Based Modelling Techniques in Cultural Heritage 3D Recording.

Grussenmeyer, P.; Landes, T.; Doneus, M.; Lerma, J. L. 2016. Basics of Range-Based Modelling Techniques in Cultural Heritage 3D Recording. 3D Recording, Documentation and Management of Cultural Heritage (Stylianidis, E.; Remondino, F., Eds.). ISBN: 978-184995-168-5. UK: Whittles Publishing. pp. 305-368.

Digital image analysis of the visible region through simulation of rock art paintings.

Carrión-Ruiz, Berta; Blanco-Pons, Silvia; Lerma, José Luis. 2016. Digital image analysis of the visible region through simulation of rock art paintings. ARQUEOLÓGICA 2.0 - 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovation. Valencia 5 – 7 September 2016. pp. 169-175, http://dx.doi.org/10.4995/arqueologica8.2016.3560

Documenting the light sensitivity of Spanish Levantine rock art paintings.

del Hoyo-Meléndez, J. M.; Lerma, J. L.; López-Montalvo, E.; Villaverde, V. 2015. Documenting the light sensitivity of Spanish Levantine rock art paintings. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, II-5/W3: 53-59. http://dx.doi.org/10.5194/isprsannals-II-5-W3-53-2015.

Review of augmented reality and virtual reality techniques in rock art.

Blanco-Pons, Silvia; Carrión-Ruiz, Berta; Lerma, José Luis. 2016. Review of augmented reality and virtual reality techniques in rock art. ARQUEOLÓGICA 2.0 - 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovation. Valencia 5 – 7 September 2016. pp. 176-183, http://dx.doi.org/10.4995/arqueologica8.2016.3561